"Benton limestone exposure 6 mi. N.W. of Fairbury, Nebr." Panoramic view of a ravine showing the layers of limestone and soil. In the foreground is a stream or waterway. Two men and two women are posed at separate locations along the ravine.

"Devil's Gulch looking SE. Canyon 225' deep." View from a relatively high point within a canyon showing the canyon walls. In the left foreground, the nearest canyon wall shows layers of different sediments and effects of erosion. Near the top...

"Gravel pit--abandoned. W. of Cedar Creek, Nebr." Photograph taken from the gravel pit, facing the side of the gravel pit and showing the exposure of soil layers and rocks. The foreground shows the floor of the abandoned pit with wooden debris...

"Same as 15/11/02/7." Image of the side of a ravine showing glacial deposits one mile west of Falls City, Nebraska. Layers of glacial boulders and glacial boulders eroding from the bank of the ravine are shown.

"View in Lahmer quarry, 7 mi. S.W. of Falls City." The photograph is taken from within the quarry, facing the side of the quarry and showing an exposure of soil layers. A man holding a gun is standing on top of the soil embankment. The foreground...

"Views of gravel pits W. of Cedar Creek Nebr.--abandoned." Photograph taken from the gravel pit, facing the side of the gravel pit and showing the exposure of soil layers and rocks. The foreground shows the floor of the abandoned pit.

Abstract Chimney Rock is mainly composed of Brule clay, not ôrock,ö with horizontal layers of volcanic ash and sandstone. The soft clay erodes easily, while the hard sandstone does not. The presence of the protective sandstone cap may explain...

Abstract Chimney Rock is mainly composed of Brule clay, not ôrock,ö with horizontal layers of volcanic ash and sandstone. The soft clay erodes easily, while the hard sandstone does not. The presence of the protective sandstone cap may explain...

Close-up view showing horizontal layers and vertical fissures in an exposed, steep area of land at the right of the image's center. To the left, a hammer rests on the ground and provides a sense of scale. Water flows at the base of the land.